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関連する概念動画

Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...

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関連する実験動画

Updated: Jul 6, 2026

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
07:58

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

Published on: August 7, 2017

1980年6月から1982年12月までのセントヘレンズ山の噴火を予測しています.

D A Swanson, T J Casadevall, D Dzurisin

    Science (New York, N.Y.)
    |September 30, 1983
    PubMed
    まとめ

    セントヘレンズ山の噴火は,地震性と地形変形を用いて数時間から数週間前に予測されました. この火山噴火の予測能力は,安全性を高め,土地利用の計画に情報を提供した.

    科学分野:

    • 地質学 地質学 地質学
    • 火山学 火山学とは
    • 地震学 地震学とは

    背景:

    • セントヘレンス山は,1980年から1982年の間に数多くの噴火を経験しました.
    • 火山活動の予測は,公衆の安全と資源管理にとって極めて重要です.

    研究 の 目的:

    • セントヘレンズ山の噴火の予測方法の有効性を分析する.
    • 火山イベントに関連するリードタイムと前駆者を評価する.

    主な方法:

    • 前駆的な地震性 (地震活動) を監視する.
    • クレーター床と溶岩ドームの地形変形を追跡する.
    • ガス排出量を分析する.

    主要な成果:

    • 1980年から1982年の間に13回の噴火が予測された.
    • 初期の予測は数時間前であったが,後の予測は3日から3週間であった.
    • 地震性,ドーム変形,ガス排出は,重要な指標でした.

    結論:

    • 火山噴火の予測は,複数の監視技術を使用して実現可能である.

    さらに関連する動画

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    Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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    Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

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    Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

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    Simulating Impacts of Ice Storms on Forest Ecosystems

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  • 改善された予測能力は,生命や財産に対するリスクを大幅に軽減します.
  • 予測データは,危険な火山地帯における土地利用計画を導くことができます.